$49 Cheap flights from Los Angeles - Ontario Intl. to Seattle - Tacoma Intl. (ONT to SEA)

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Find The Best Dates To Fly from Los Angeles - Ontario Intl. to Seattle - Tacoma Intl.

Compare Flight Prices from Ontario to Seattle

Affordable Airfare Tickets from ONT to SEA Airport

The cheapest flights to Seattle - Tacoma Intl. found within the past 7 days were $100 round trip and $49 one way. Prices and availability subject to change. Additional terms may apply.

Sat, May 31 - Sat, Jun 7
ONT
Ontario
SEA
Seattle
$100 Roundtrip, just found
$100
Roundtrip
just found
Select Frontier Airlines flight, departing Sat, May 31 from Ontario to Seattle, returning Sat, Jun 7, priced at $100 just found
Tue, Jun 3 - Tue, Jun 10
ONT
Ontario
SEA
Seattle
$102 Roundtrip, found 1 day ago
$102
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Tue, Jun 3 from Ontario to Seattle, returning Tue, Jun 10, priced at $102 found 1 day ago
Wed, Jun 11 - Sat, Jun 14
ONT
Ontario
SEA
Seattle
$103 Roundtrip, found 4 hours ago
$103
Roundtrip
found 4 hours ago
Select Frontier Airlines flight, departing Wed, Jun 11 from Ontario to Seattle, returning Sat, Jun 14, priced at $103 found 4 hours ago
Tue, Jun 10 - Sat, Jun 14
ONT
Ontario
SEA
Seattle
$105 Roundtrip, found 5 hours ago
$105
Roundtrip
found 5 hours ago
Select Frontier Airlines flight, departing Tue, Jun 10 from Ontario to Seattle, returning Sat, Jun 14, priced at $105 found 5 hours ago
Thu, May 29 - Tue, Jun 3
ONT
Ontario
SEA
Seattle
$110 Roundtrip, found 1 hour ago
$110
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Thu, May 29 from Ontario to Seattle, returning Tue, Jun 3, priced at $110 found 1 hour ago
Mon, Jun 2 - Tue, Jun 10
ONT
Ontario
SEA
Seattle
$112 Roundtrip, found 1 day ago
$112
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Mon, Jun 2 from Ontario to Seattle, returning Tue, Jun 10, priced at $112 found 1 day ago
Wed, May 28 - Thu, May 29
ONT
Ontario
SEA
Seattle
$112 Roundtrip, found 10 hours ago
$112
Roundtrip
found 10 hours ago
Select Frontier Airlines flight, departing Wed, May 28 from Ontario to Seattle, returning Thu, May 29, priced at $112 found 10 hours ago
Wed, Jun 11 - Mon, Jun 16
ONT
Ontario
SEA
Seattle
$113 Roundtrip, found 1 day ago
$113
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Wed, Jun 11 from Ontario to Seattle, returning Mon, Jun 16, priced at $113 found 1 day ago
Sat, Jun 7 - Tue, Jun 10
ONT
Ontario
SEA
Seattle
$117 Roundtrip, found 3 hours ago
$117
Roundtrip
found 3 hours ago
Select Frontier Airlines flight, departing Sat, Jun 7 from Ontario to Seattle, returning Tue, Jun 10, priced at $117 found 3 hours ago
Fri, May 30 - Mon, Jun 2
ONT
Ontario
SEA
Seattle
$120 Roundtrip, found 1 hour ago
$120
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Fri, May 30 from Ontario to Seattle, returning Mon, Jun 2, priced at $120 found 1 hour ago

Seattle - Tacoma Intl. flight + hotel packages - economy flights

Price found within the past 48 hours. Click for updated prices.
Emerald Queen Hotel & Casino

Emerald Queen Hotel & Casino

3 out of 5
Save 100% on your flight
per person
Jun 9 - Jun 16
found 1 day ago
Roundtrip flight included
Ontario (ONT) to Seattle (SEA)
Beacon Hill Retro - Central Location

Beacon Hill Retro - Central Location

3 out of 5
per person
Jun 19 - Jun 22
found 23 hours ago
Roundtrip flight included
Ontario (ONT) to Seattle (SEA)
Hillside in Seattle - well appointed

Hillside in Seattle - well appointed

3 out of 5
Save 100% on your flight
per person
Jun 12 - Jun 15
found 2 days ago
Roundtrip flight included
Ontario (ONT) to Seattle (SEA)
Denny Park Hotel

Denny Park Hotel

4 out of 5
Save 100% on your flight
per person
Jun 12 - Jun 15
found 2 days ago
Roundtrip flight included
Ontario (ONT) to Seattle (SEA)
Emerald Queen Hotel and Casino - Tacoma

Emerald Queen Hotel and Casino - Tacoma

4 out of 5
Save 100% on your flight
per person
Jun 9 - Jun 16
found 1 day ago
Roundtrip flight included
Ontario (ONT) to Seattle (SEA)
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Frequently asked questions

Are there direct flights from ONT to Sea-Tac Airport?
Multiple airlines offer direct flights from Los Angeles - Ontario Intl. Airport (ONT) to SEA. These include Alaska Airlines and Delta — start with them if you want to touch down at Seattle sooner rather than later.
How long is the flight from ONT to Sea-Tac Airport?
Getting from Los Angeles - Ontario Intl. Airport (ONT) to Sea-Tac Airport shouldn’t be too laborious, with flights taking 2 hours and 44 minutes on average. With such a quick journey ahead of you, you’ll hit the tarmac feeling relaxed and ready to enjoy the next leg of your trip.
What is the flight distance from Ontario Airport to Seattle - Tacoma Intl. Airport (SEA)?
There’s a flight distance of 960 mi between Ontario Airport and Sea-Tac Airport. This is classified as a medium-haul flight. There’ll be plenty of time to watch the in-flight entertainment and squeeze in a snooze if you’re feeling tired.
What airlines fly from Ontario Airport to SEA?
If you need to get to Seattle from Ontario, there are a number of airlines with direct flights. One of the most popular is Alaska Airlines (AS), which offers 108 flights on this route each month. An alternative is Delta (DL), which offers 91 flights every month. The more air carriers you consider, the more likely you are to snap up a sensational deal.
What is the best day to buy a plane ticket?
This just in! Airfares offered on Thursdays tend to be the cheapest, according to flight demand on Travelocity in 2021. Tuesday and Wednesday prices are also good, but you may want to prepare your budget if booking during the weekend, as data shows that is when prices are generally at their highest.
What are the cheapest days to fly?
Frequent travelers may already know this, but earlier in the week can be the cheapest time to fly. In 2021, flights departing on a Monday were generally the cheapest of the week, whereas you may pay a premium for weekend flights when demand is usually high. On average, tickets were most expensive for Saturday departures, so if you need to fly out on a weekend, you might look for deals ahead of time.
How far in advance can you book a flight?
Trying to figure out how early you should book your flight? It’s possible to start comparing international airfares on Travelocity up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2021 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 0-2 weeks prior to their travel dates.*According to flight demand on Travelocity.com from January to December 2021. Savings are subject to change based on departure location, date and destination.

Flight information from Ontario to Seattle

 

Traveling From
Los Angeles - Ontario Intl.
Traveling To
Seattle - Tacoma Intl.
Shortest Flight Time
 hours mins
Earliest Departure Time
Latest Departure Time
Lowest Flight Price
$100

Route Info

Flight path for flights from LA/Ontario International Airport to Seattle-Tacoma International Airport.


Origin:
ONT - LA/Ontario International Airport
Destination:
SEA - Seattle-Tacoma International Airport
Distance:
1,047.00 miles


Discover our best flights from Ontario ONT to Seattle SEA. 

With 20 airlines to choose from on Travelocity, you can easily find the best option for you. Use our filters to sort by price, compare airlines, and find the most convenient flight times. 

 

Find our best return flights from Ontario ONT to Seattle SEA at the right price  

Airfares to Seattle SEA from Ontario ONT currently cost between $100 and $120. It’s usually cheaper to book a round trip than two separate one-way flights. Prices and availability subject to change. Additional terms may apply. 

 

Book one-way flights from Ontario ONT to Seattle SEA 

If you want to be flexible about when you return, or keep your travel options open ended, a one-way flight could be just the ticket! You’ll find one-way airfares from Ontario ONT to Seattle SEA on Travelocity starting at $49. Prices and availability subject to change. Additional terms may apply. 

 

Get to Seattle SEA from Ontario ONT quicker with direct flights. 

Get to Seattle faster, without the hassle of changing planes and moving baggage, by booking a direct flight. Expect your direct flight to SEA from ONT to take around hour(s) min(s).  

 

Find our cheapest airfares for flights from Ontario ONT to Seattle SEA

Find cheap flight deals by using our search filters to sort results starting with the lowest price airfares to SEA from ONT. Our Price Match Promise means if you find a lower rate on Travelocity.com or on another US-based website within 24 hours of booking, we’ll credit or refund the difference.  

 

Get our best airfare deals for your flight from Ontario ONT to Seattle SEA today 

If you’re flexible about when you travel, May is usually the cheapest month to fly from Ontario ONT to Seattle SEA. If you need to be more specific, search by date and arrival and departure times.Then, compare prices across different airlines, and sort results by lowest price first. 

 

Book flexible airline tickets for flights to Seattle SEA from Ontario ONT 

Some airlines let you change your travel dates without charging a fee. Use our ‘no change fee’ filter to see which flights to SEA from ONT have this option.  

 

Travel with confidence when you book flights to Seattle SEA from Ontario ONT with Travelocity 

We’ve secured fantastic deals with all the main airline carriers and it’s easy to compare, choose, and book with Travelocity. With 24/7 customer service and our free 'App', we’ll always keep you moving. 

*Price based on the lowest price found within past 24 hours and based upon one night stay for two adults over the next thirty days. Prices and availability subject to change. Additional terms may apply.